ESR - Electron Spin

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 Code Number :   7B20.33

Disclaimer:

Reprinted by permission of Dick Berg, University of Maryland, for use on this website.

The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources.

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Condition :   Excellent  
Principle :   Plus and minus 1/2 spin.

 

Area of Study :  Modern Physics  
Equipment :   Teach Spin Apparatus, Standard ball with stem,  Special ball without stem.
  
Procedure :   Place the ball without the stem into the apparatus and turn on the magnetic field.  Do not spin the ball.  Switching the direction of the magnetic field also flips the ball 180 degrees.  Precession due to applied magnetic field can also be shown if the ball is spun carefully about a central axis.  
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   References
Harold A. Daw, M. Ramona Daw Pomeroy, "The Free Rotator Apparatus", AJP, Vol. 69, # 3, p. 289, March 2001.

Malcolm Correll, "Mechanical Analog of Electron or Nuclear Spin Resonance", AJP, 33 (4), April 1965, p.xxvi.

Harold A. Daw, "Two Air-Supported Devices for Physics Laboratories and for Physics Demonstrations", AJP, 33 (4), April 1965, p. 322.

 

Mark Wilson, "Scanning Tunneling Microscope Measures the Spin-Excitation Spectrum of Atomic-Scale Magnets,"  Physics Today, July 2006, p. 13.

 



Mail Questions and Comments to:  Dale Stille